com.facebook.stats.mx.TestStats.java Source code

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Here is the source code for com.facebook.stats.mx.TestStats.java

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/*
 * Copyright (C) 2012 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.stats.mx;

import com.google.common.collect.ImmutableMap;
import org.apache.commons.math3.analysis.function.Add;
import org.testng.Assert;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;

public class TestStats {
    private static final String NOT_INSERTED_KEY = "not Inserted";
    private static final String KEY1 = "key1";
    private static final String KEY2 = "key2";
    private static final String KEY3 = "key3";
    private static final String ZERO_COUNTER = "to-0-counter";
    private static final String COUNTER_TO_SET = "count-to-set";
    private static final String COUNTER_NOT_SET = "counter-not-set";

    private Map<String, String> attributeMap = new ImmutableMap.Builder<String, String>().put(KEY1, KEY2)
            .put(KEY2, KEY3).put(KEY3, KEY1).build();

    private Stats stats;

    @BeforeMethod(alwaysRun = true)
    void setup() {
        stats = new Stats();
    }

    public void verifyStatAttributes() {
        // Test out getAttribute calls
        Assert.assertEquals(stats.getAttribute(KEY1), KEY2);
        Assert.assertEquals(stats.getAttribute(KEY2), KEY3);
        Assert.assertEquals(stats.getAttribute(KEY3), KEY1);
        Assert.assertNull(stats.getAttribute(NOT_INSERTED_KEY));
        stats.setAttribute(KEY1, KEY1);
        Assert.assertEquals(stats.getAttribute(KEY1), KEY1);
        stats.setAttribute(KEY1, KEY2);

        // Test out that the stats attributemap is as expected
        Map<String, String> statsAttributes = stats.getAttributes();
        Assert.assertEquals(attributeMap, statsAttributes);
    }

    /**
     * Test the setAttribute(String, String) function
     */
    @Test(groups = "fast")
    public void testAttributeString() {
        for (Map.Entry<String, String> attribute : attributeMap.entrySet()) {
            stats.setAttribute(attribute.getKey(), attribute.getValue());
        }
        verifyStatAttributes();
    }

    /**
     * Test the setAttribute(String, Callable <String> ) function
     */
    @Test(groups = "fast")
    public void testAttributeCallable() {
        for (final String key : attributeMap.keySet()) {
            stats.setAttribute(key, new Callable<String>() {
                @Override
                public String call() throws Exception {
                    return TestStats.this.attributeMap.get(key);
                }
            });
        }

        verifyStatAttributes();
    }

    @Test(groups = "fast")
    public void testGetEmptyCounter() throws Exception {
        Assert.assertEquals(stats.getCounter("fuu"), 0);
    }

    @Test(groups = "fast")
    public void testDynamicCounters() throws Exception {
        LongWrapper longValue = new LongWrapper(1);
        final String name = "testCounter";
        Assert.assertTrue(stats.addDynamicCounter(name, longValue));
        final Map<String, Long> exported = new HashMap<>();
        stats.exportCounters(exported);
        Assert.assertEquals(exported.get(name), Long.valueOf(1));

        // Test that the value gets exported
        longValue.setValue(123);
        exported.clear();
        stats.exportCounters(exported);
        Assert.assertEquals(exported.get(name), Long.valueOf(123));

        // Test that a duplicate set fails to override the previous value
        LongWrapper duplicateValue = new LongWrapper(24);
        Assert.assertFalse(stats.addDynamicCounter(name, duplicateValue));
        exported.clear();
        stats.exportCounters(exported);
        Assert.assertEquals(exported.get(name), Long.valueOf(123));

        // Test unset
        Assert.assertTrue(stats.removeDynamicCounter(name));
        exported.clear();
        stats.exportCounters(exported);
        Assert.assertFalse(exported.containsKey(name));

        // Test unset for non-existent key
        Assert.assertFalse(stats.removeDynamicCounter(name));
    }

    @Test(groups = "fast")
    public void testSetCounterValue() throws Exception {
        stats.incrementCounter(COUNTER_TO_SET, 2);
        stats.incrementCounter(COUNTER_TO_SET, 20);
        stats.incrementCounter(COUNTER_TO_SET, 200);
        Assert.assertEquals(stats.getCounter(COUNTER_TO_SET), 222);
        Assert.assertEquals(StatsUtil.setCounterValue(COUNTER_TO_SET, 1001, stats), 222);
        Assert.assertEquals(stats.getCounter(COUNTER_TO_SET), 1001);
    }

    @Test(groups = "fast")
    public void testReset() throws Exception {
        Assert.assertEquals(stats.getCounter(ZERO_COUNTER), 0);
        stats.incrementCounter(ZERO_COUNTER, 1);
        stats.incrementCounter(ZERO_COUNTER, 10);
        stats.incrementCounter(ZERO_COUNTER, 100);
        Assert.assertEquals(stats.resetCounter(ZERO_COUNTER), 111);
        Assert.assertEquals(stats.getCounter(ZERO_COUNTER), 0);
    }

    @Test(groups = "fast")
    public void testResetBeforeCallingIncrementOrGet() {
        stats.resetCounter(COUNTER_NOT_SET);
        Assert.assertEquals(stats.getCounter(COUNTER_NOT_SET), 0);
    }

    /**
     * Helper class for testing dynamic counters.
     */
    private static class LongWrapper implements Callable<Long> {
        private LongWrapper(long value) {
            this.value = value;
        }

        public void setValue(long value) {
            this.value = value;
        }

        private long value;

        @Override
        public Long call() throws Exception {
            return value;
        }
    }
}